77056220 has 24 divisors (see below), whose sum is σ = 165766608. Its totient is φ = 30070400.

The previous prime is 77056201. The next prime is 77056249. The reversal of 77056220 is 2265077.

It is a happy number.

It is a super-2 number, since 2×77056220² = 11875322081376800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46166 + ... + 47805.

It is an arithmetic number, because the mean of its divisors is an integer number (6906942).

Almost surely, 2^77056220 is an apocalyptic number.

It is an amenable number.

77056220 is an abundant number, since it is smaller than the sum of its proper divisors (88710388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77056220 is a wasteful number, since it uses less digits than its factorization.

77056220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94021 (or 94019 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 77056220 is about 8778.1672346795. The cubic root of 77056220 is about 425.5356015471.

The spelling of 77056220 in words is "seventy-seven million, fifty-six thousand, two hundred twenty".